McKean is both a great comedian and an excellent dramatic actor. He has earned a lot of fans with his hilarious roles as Lenny in Laverne and Shirley and David St. Hubbins in This Is Spinal Tap. He has also appeared as Mr. Green in Clue, Perry White in Smallville, and various parts on Saturday Night Live. He was one of the terrific ensemble stars of Christopher Guest's series of mockumentary movies: Best in Show, A Mighty Wind, and For Your Consideration.
He is a hardworking, talented actor, and I wish him a full and speedy recovery. And I'm sure he would appreciate the jokes about not taking the good luck term "break a leg" so literally! :)